Black Filter Style is used to apply filter only to the 'Black Area' of the image.'Black Area' are the darker pixels of the image and the user can very precise while defining which pixels even though dark should be included while applying the filter.'Threshold' is the input field which is used to enter the value which will decide which pixels should be included and which pixels should be excluded while applying the filter.User will enter the 'Threshold' value and if the pixel brightness is less than the 'Threshold' value than the pixel belongs to the 'Black Area' and filter will be applied to these pixels only.For e.g :- If the 'Threshold' is 128 then most of the darker pixels will be applied the filter while the brighter pixels will be excluded from the filtering.But,if the 'Threshold' is 3 then only the pixels with the black color will be applied the selected filter.Any of the filters of the Lobster application can be chosen for applying the filter to the 'Black Area'.

Following snapshot shows the image which has been applied the 'Red Channel' with the 'Threshold' value of 78(Darker pixels only) to create a 'Red Head Effect'.

This snapshot is another implementation of the Black Filter Style where the 'Find All Edges' filter is used to 'Oiled Haired Effect'.